add README

README.md

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+PeterCxy's Dotfiles
+---
+
+These files are supposed to be installed by GNU Stow. For example, if you want to install the dotfiles for `sway` listed in this directory, then clone this repository to your `$HOME`, and then run
+
+```bash
+stow sway
+```
+
+which will automatially create all the symlinks needed.
+
+All subdirectories (except `fonts`) in this repository are structured with the assumption that you are going to put the repository directly in `$HOME`. If not, you need to change the command for `stow` accordingly.
+
+Note that to install `fonts`, you need `sudo stow -t / fonts` instead.